Question

Sum of the digits of a two digit number is 9. When we interchange the digits , it is found that the resulting new number becomes twice the other new number. What are the numbers?

Answer 1

Answer:

x+10(9-x) =2(10x+9-x)

x+90-10x=19x+19

90-9x=19x+19

90-19=19x+9x

71=28x

x=71/28

2.53